My problem with this sort of thing is that if you get it heavy enough to do what you want, it tries to submarine and pile dirt up on top of it. I would think that having a round pipe as the first element would prevent that; unlike a piece of angle iron or something square.....blunt face.
I use a commercially built chain harrow that works good. I can't advise on number of pipes you mentioned nor spacing. Might just cobble something together that is easily disassembled and experiment till you get the recipe then build it to last.